Had trouble with mine a bit ago. When we were checking various things we found a silver box tucked up directly above the brake pedal . One of these wires gives a feed to the pump. I think it's the one with the spade connector a different way round to the rest. It may be loose. Might be worth a try

Does it start and die every time or sometimes does it not start ? If so,it could point to a dodgy distributor. That's what mine turned out to be